Find the percent of increase

Question

In 2004, 21 million people in the US subscribed to high-speed internet service via their cable provider. By 2012, this number had increased to 50.3 million. What was the percent of increase?

Answer 1

% increase = 100 x (new - old)/old

 

(100%)(50.3 - 21)/21 ≅ 139.5%

 

% increase is about 139.5%